Additel ADT 286 [ADT286-220V] Multifunction Reference Thermometer Readout (Base Unit Only), 220V. The Additel ADT 286 Multifunction Reference Thermometer combines the capabilities of a high-end reference thermometer with a highly capable data acquisition system and 8.5 digit multimeter. The ADT286 is capable of scanning and recording up to 82 channels at 10 channels per second. Users can easily configure the ADT286 to perform field calibrations and uniformity studies as well as use the unit in the lab as a precision thermometer and 8.5 digit multimeter.